28938145 has 8 divisors (see below), whose sum is σ = 34846056. Its totient is φ = 23070336.

The previous prime is 28938139. The next prime is 28938157. The reversal of 28938145 is 54183982.

It can be written as a sum of positive squares in 4 ways, for example, as 6290064 + 22648081 = 2508^2 + 4759^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28938145 - 2³ = 28938137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28938098 and 28938107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8412 + ... + 11341.

It is an arithmetic number, because the mean of its divisors is an integer number (4355757).

Almost surely, 2^28938145 is an apocalyptic number.

It is an amenable number.

28938145 is a deficient number, since it is larger than the sum of its proper divisors (5907911).

28938145 is a wasteful number, since it uses less digits than its factorization.

28938145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20051.

The product of its digits is 69120, while the sum is 40.

The square root of 28938145 is about 5379.4186488876. The cubic root of 28938145 is about 307.0130924188.

The spelling of 28938145 in words is "twenty-eight million, nine hundred thirty-eight thousand, one hundred forty-five".